Governor for fluid motors



Nov. 8, 1932. J. R. HOFFMAN- GOVERNOR FOR FLUID MOTORS 2 Sheets-Sheet l lnneutor Filed Oct. 10.

Gitan-nega.

2 Sheets-Sheet 2 Nov. 8, 1932. J. R. HOFFMAN GOVERNOR FOR FLUID MOTORS Filed oct. 1o. 1951 ychange in speed. Thus,

Patented Nov. 8. 1932 `UNITED STATES PATENT OFFICE Joan n HOFFMAN, or mAnIsoN,

non,

mIsoN-xlrr couronnor wrsoonsm GOVERNOR FOB FLUID MOTORS Application led October 10, 1931.

This invention relates to governors for fluid motors, and more particularly to means for governing thespeed of rotary, pneumatic tools, such as grinders and the like.

The primary purpose of the invention is to provide improved overnfing means for controlling eiliciently t e operation of the motor, whereby it may be limited to a desired speed. This is particularly advantageous in high speed, pneumatic grinders, employing turbines, wherein a definite speed of operation of the turbine and its driving spindle has been found to ve particularly satisfactory results. In ad ition, such governing means serve to prevent racing of the tool and possible breakage resulting therefrom. y

. An important object of the invention, especially in its application to high speed, turbine-driven grinders, is the designing of a governor which is extremely sensitive, so as tobe effective upon a comparatively small the governor permits the tool to operate under service conditions at a certain maximum high speed, but becomes effective to throttle the flow of air and slow down the tool upon a small increment of speed over the maximum. Special means are included in the governing mechanism for protectin it against wear or other damage, and thereiy insuring proper unctioning of the governor at all times. Provision is made also for ready and accurate adjustment of the governing means to vary the maximum speed of the turbine, when desired.

A further feature is the functioning of the governor as a valve which controls esca-pe of exhaust fluid from the turbine, and thereby directly regulates operation of the latter. The governor is of simple, inexpensive construction and is designed particularly for operation in a small space without loss in efficiency of operation. It is readily mounted and adjusted on the turbine spindle and detached therefrom as a self-contained unit.

Other objects and advantages of the invention will appear from the detailed description given below when read in connection with the accompanying drawings, wherein Fig. l is a longitudinal section of one type Serial No. 568,151.

of fluid pressure tool embodying the preferred form of the invention, the governor being shown in the normal, inoperative position which it maintains as long as the speed of the tool is not in excess of the maximum speed for which the governor is designed;

Fig. 2, a similar, fra entary view, enlar ed to show the details of the governor wit the parts in the same position;

Fig. 3, a similar view showing the governor in the extreme operative osition which it assumes to throttle the tur ine, when the latter exceeds :its predetermined maximum speed;

Fig. 4, a perspective of the govemor roper, certain of t e parts thereof being isassembled to show the details of construction;

Fi 5, a view, similar to Fig. 2, of a modified orm of the invention, the governor being in its inoperative position; and

Fig. 6, a similar view thereof the governor appearing in its operative posi ion.

In the drawings, the invention is illustrated as applied to a hi h-speed, pressurefluid operated grinder o the general ty e covered by the pending applications of J o n R. Hoffman, Serial No. 419,417, filed January 8, 1930, and Serial No. 548,245, filed Jul 1, 1931; and that of Axel Pedersen, Serial o. 563,202, filed September 16, 1931.` No claim is made herein to such features of construction and operation of the tool as are covered by these ap lications, 'but only to the imrovements liereinafter pointed out.

As shown, the rinder comprises a tool casing consisting o a barrel 11 formed with a large head ortion 12 at its inner end and a smaller hea portion 13 at its opposite end.

Located within head portion 1 2 and formed integrally with the tool casing are a plurality of inwardly projecting, radial ribs 14. The smaller head portion 13 of the casing also is formed with a similar set of radial ribs 15, the purpose of the two sets of ribs being to receive and support pro rly in axia alinement certain rotor sha bearings as explained hereinafter.

A plug-type closure 16, provided with a reduced inner portion 17, is located in the open end of head portion l2, its inward movement being limited by shoulder 18. The closure is secured in place by screw 19 extending through the closure and into a threaded recess 20 in the end of head portion 12 of the casing.

Closure 16 is provided with an axial bore 21 which connects at its forward end with a plurality of radial ducts 22 terminating in ports 23 (only one of which is shown) i on the inner face 24 of the closure. A pressurefluid control valve 25, provided with an adjustin knob 26 is rotatably mounted in bore 21. alve 25 has an axial passage 27 therein which opens at one end into the forward portion of bore 21. At its rear end passage 27 opens laterally for registry with a pressure-fluid inlet duct 28 when the tool is to be operated'. A suitable air strainer 29 is located in duct 28, while a ni ple 30, to which a hose 31 is attached, is tiireaded into the outer end of duct 28.

A set screw 32 projects into bore 21 of closure 16, as shown in Fig. 1, and coacts with a cross roove 32 in valve 25 to prevent removal o the valve and to limit rotary movement thereof in both directions. In the position of the parts shown,-stop 32 engages one end of groove 32 and inlet duct 28 communicates with passage 27 to deliver pressurefluid to radial passages 22. When knob 26 is rotated in the opposite direction until stop 32 engages the other end of groove 32, inlet port 28 is blanked by the stem of valve 25 and passage of pressure-fluid to duct 27 and radial passages 22 is prevented. Obviously by suitable manipulation of knob 26, valve 25 may be moved Into intermediate positions, thereby delivering varying amounts of pressure-fluid to'passage 27.

Mounted for rotation within the tool casing pro er is a rotor consisting of a shaft or spin le 33 and a runner 34 attached to the inner end of the shaft. Runner 34 has a plurality of radial buckets 35 formed on one face thereof and extending between inner and outer flanges 36, 37, the buckets35 being operatively arranged relative to outlet ports 23 in closure 16, as shown in Fig. 1.

In order to obtain maximum driving power from the pressure-fluid acting on runner 34, it has been found important to reduce to a minimum the operating clearances between face 24 of the closure and flanges 36, 37 of the runner. In this manner, rassure-fluid impinging upon the runner uckets from ports 23 is prevented by inner flange 36 from escaping towards the axis of the runner, but, after exhausting substantially all of its kinetic energy in actuating the runner, escapes r between outer flange 37 `and the face of closure 16. The restricted, annular exhaust assage formed by these arts tends to throttlJe the flow of fluid from etween runner 34 and the opposed face of closure 16. Thus, the pressure-fluid is retained between rims 36, 37 for a longer period and full and complete use is made of its velocity head to operate the runner. It will be noted that the fluid, after acting on the runner, escapes uniformly about the periphery thereof; also, that there are no exhaust ports located between the operating face of the runner and closure 16.

Shaft or spindle 33 is rotatably mounted in a pair of anti-friction' bearings 38, 39. Balls 40 of inner bearing 38 cooperate with inner ball race 41, secured to shaft 33, and an outer race 42, supported in notches 43 formed in ribs 14. Similarly, balls 44 of outer bearing 39 coact with races 46 and 47, the latter being supported in notchesl48 in ribs 15.

Shaft 33 issplit at its outer end and is threaded to receive a nut, thereby formiig a chuck or tool-holding socket 49. It is attened at 51 to rece1ve a wrench, when a mounted grinder wheel 52 or other suitable tool element is being clamped in the chuck.

In order to lubricate bearings 38, 39 properly, shaft 33 is formed with a lubricant-conn taining chamber 53. A rear set of radial ducts 54 and a front set of similar ducts 56 lead from chamber 53into bearings 38, 39, respectively,'so as to supply oil thereto from chamber 53 as a result of the centrifu al force acting upon the lubricant, when t e tool is in operation. Lubricant is supplied to passage 53 from the outer end of s aft 33 through the chuck before tool element 52 is clamped in place.

Both front and rear ball bearings 38, 39 are protected by air dellecting washers 57, 58, which prevent the compressed air from forcing the lubricant from the bearings. Each Washer 57, in conjunction with Washer 58, forms a s ace to receive an annular felt pack` ing 59. ressure-luid is also prevented from passing through outer bearing 39 yby an annular delector 61 xed on shaft 33 just to the rear of this bearing. Y

A rivet 62 closes the inner end of lubricant chamber 53 in the grinder spindle. The rivet coacts with an adjustable screw 63 to form is threaded through face 24 of closure 16 and is accessible for adjustment through bore 21 when valve 25 is removed. A lock uut 64 serves to secure screw 63 in any desired adjusted position.

In operation, a source of pressure fluid having been connected to hose 31, ressure fluid will enter passage 27 when va ve 25 is moved tothe position of Fig. 1. It then passes into radial ducts 22 and escapes from eually spaced ports 23, striking the blades o runner 34 and setting the rotor in motion. After expanding its force on the blades of the runner, the fluid escapes around the outer flange 37 into the chamber in -head 12. `The exhaust luid then passes into cooling contact with the exterior of ball bearing 40 and a thrust bearing for spindle 33. Screw 63 invention, will be described now.

The governor is fixed on shaft or spindle 33 and is adapted to Vrotate with the shaft in barrel 1.1. The preferred form of the governor appears in Figs. 1 to 4. As shown, 1t comprises an inner metal sleeve 66, a pair of metal collars 67 68 fixed on the ends theregether so as governor 1n Fig.

annular groove of, an outenmetal sleeve 69 fixed on collar 67 and an intermediate rubber sleeve 71 secured only at its ends to Sleeve 66 by collars 67 68. These parts, forming the governor, are mounted as an assembled unit on shaft 33 intermediate ball bearings 38, 39 before deflector 61and the other parts are located on the outer end of the shaft.

The governor unit is pressed securely into place on' shaft 33, whereby it is made to rotate therewith, the alined central openings through sleeve 66 and collars 67, 68, which are of the same diameter, being properly dimensioned for this urpose.

The details o construction of the governor are shown best in Fig. 4. Collar 67 is enlarged internally at 7 2 to receive one end of inner sleeve 66, the parts being pressed toto secure them against relative movement. Collar 67 is formed internally also with an annular groove 73 and an adjoining, annular rib or tongue 7 4, the purpose ofy which will appear shortly.

Collar 68 is secured on the opposite end of sleeve 66 similarly to collar 67, the collar being enlar internally at 7 5 to receive the sleeve, which is forced tightly therein. Likewise, collar 68 is provided internally with an 76 and an adjoining annular rib 77.

Rubber sleeve 71, which forms the active governor member of the assembly, fits snugly about the central portion of metal sleeve 66, but as stated, is secured to the unit only at its ends b v collars 67, 68. This is shown particularly clearly in the operative position of the 3. The ends of rubber sleeve 71 project between inner sleeve 66 and the spaced inner lend portions of collars 67, 68, where the are provided with annu ar ribs .'78, 79 and a joining annular grooves 81,82, which interlock with the corresponding annular ribs and grooves on the collars 67 68.

In practice, the governor unit is assembl partly by' first pressing collars 67, 68 firmly into place on the ends of sleeve 66 until they abut shoulders 83, 84 in the collars. Rubber sleeve 71 is then molded in place around the central portion of sleeve 66. The rubber sleeve preferably is made sufficiently thick to locate its outer surface substantially Bush with the outer surfaces of collars 67, 68.

During the molding operation just mentioned, the rubber is forced to iow into the annular spaces between sleeve 66 and the inner ends of collars 67, 68, thereby forming the grooved and ribbed ends of the rubber sleeve which interlock with the collars. Inner sleeve 66 being of steel, the rubber sleeve thus formed does not adhere tightly thereto. Consequently, the central portion of rubber sleeve 71 is free to stretch and move outwardly, because of the centrifugal force, when shaft 33 revolves at an excessive speed.

Outer metal sleeve 69, which is pressed into place on collar 67 so as to rotate with the governor unit, is enlarged at its forward end to form an annular shroud 86 surrounding the free central portion of rubber sleeve 71. At its inner end shroudk portion 86 is provided with an annular series of openings 87 througih which exhaust air from the turbine normal y between barrel 11 and sleeve 69 into the space 88 between the shroud and rubber sleeve 71. The part of shroud 86 in which openings 87 are located is tapered interiorly so as to form an annular, tapered seat for rubber sleeve 7l, when the latter is performing its governing or throttling function, as illustrated in Fig. 3. The outer end of shrould 86 preferably is cylindrical and of uniform thickness, while its outside diameter is such as to leave an annular space 89 between the shroud and barrel 11.

Exteriorly sleeve 69 is tapered from a point 91 at the forward edges of openings 87 to the inner end of the sleeve, so as to interfere as little as possible with the passage of pressure fluid through and past the governor. The forward end of collar 68 is tapered at 92 for the same purpose.

In the operation of passes from the space the tool, the governor functions as follows. Exhaust motive duid from turbine runner 34 passes into barrel 11 and flows normally both around and through the governor unit on its way to the exhaust outlet at the outer end ofthe casing. The stream of exhaust fluid is divided upon entering the annular space 93 between outer sleeve 69 and the tool casing, the bulk of the fluid passing by way of openings 87 through space 88, between outer sleeve 69 and rubber sleeve 71, while the remainder passes through annular space 89, between outer sleeve 69 and the casing.

In practice, annular space 89 serves merely as an operating clearance between protector sleeve 69 and the casing. Consequently, this space is slight and permits the passage therethrough of only al small amount of exhaust fluid. On the other hand, annulli.)

entirely annular space 88 when the ru berlar space 88 is much larger so as to permit free passage of exhaust fluid from the turbine runner and operation of the grinder spindle at full operating speed.

Sleeve 71 of the governor is made of specially cured rubber and all o f the parts of the governor are properly dimensioned and arranged relatively to each other and to the tool casing, so that the spindle and the attached governor unit may revolve up to a predetermined maximum speed without the governor functioning to cut down the speed of the spindle. However, as soon as spindle 33 exceeds this maximum speed, the increased centrifugal force imparted to rubber sleeve 71 causes the central free portion thereof to expand or stretch, thereby gradually cutting down and finally closin olf sleeve contacts with the interior of protector sleeve 69, as shown in Fig. 3. The expansion of rubber sleeve 71 also e'ectively seals the annular series of openings 87 in the protector sleeve and passage of exhaust Huid beyond the governor is prevented, except for the small amount that escapes through clearance space 89. This is insufficient to 4drive the' rotor at a suitable operating speed.

As a result of this throttling or valve action of sleeve 71, the passage of motive fluid through the turbine runner is retarded, thereby slowing up operation of the runner and cutting down the speed of the spindle 33 to or below its maximum. Concurrently with this reduction in speed of spindle 33, and conseuently in the centrifugal force imparte to rubber sleeve 71, the sleeve resumes lts normal cylindrical shape of Fi 2 and thereby permits the free passage o exhaust Huid into openings 87 and through annular space 88. Governor valve or sleeve 71 is then in position to function again to throttle the exhaust outlet of the rotor and reduce the speed of the spindle as soon as it exceeds its maximum.

Outer sleeve 69 serves not only to limit the expandin action of rubber sleeve 71, but also protects t e sleeve from possible damage, particularly such harmful wear thereon as would be occasioned were the rapidly rotating rubber sleeve permitted upon expanding to come into contact with any stationary part, such as the interior of the casing, or

'with some part rotating at a different speed.

Since outer sleeve 69 is rotating at the same speed as is rubber sleeve 71, both sleeves being driven by spindle 33, there is no relative rotative movement between these parts at any time. Consequently, there is no chance of harmful rubbing action of onel part on the other, when, in operation, the rubber sleeve expands against the interior of the protector sleeve. The parts of the governor simply rotate together as a unit at all times.

The presence of protector sleeve 69 is particularly advantageous in cases where spindle 33 is operating at full speed and the motive fluid supply is shut olf suddenly at valve 25. There being insuicien't uid pressure in the casing at this time to resist the expanding in the absence of protector sleeve 69, woul result in expansion of the rubber sleeve until it contacted with the casing, thereby damaging the rubber sleeve. With the protector tendency of rubber sleeve 71, such tendencyi im sleeve in place, sudden cuttin o of the fluid fied device is shown in Fig. 5. With this arrangement, there is provided a single annular space 94 for the passage of exhaust Huid between rubber sleeve 71 of the overnor device and the tool casing. Until t e maximum speed of rotation of spindle 33 is exceeded, rubber sleeve 71 remains in the position shown, so as to permit free passage of exhaust fluid from runner34 through annular passage 94 and thereby enable the spindle to operate at full speed. However, upon a small increment of speed over'tle maximum for which the parts are designed and set, centrifu al force acts upon ythe free portion of rub r sleeve 71 to expand it towards the interior of the casing, as shown in Fig. 6. This immediately throttles the flow of exhaust fluid through the casing, thereby slowing up opera. tion of the runner and restoring the s ed ofspindle 33 to or below its maximum. oncurrently, rubber sleeve 71 automatically resumes its original form of Fig. 5, ready for subsequent o erations whenever the maximum speed o the spindle is exceeded.

The modified device has provisionfor adjustment, whereby the maximum speed at which the governor operates may be varied to suit different operating conditions. As appears from Figs. 5 and 6, barrel 11 of the tool casing is formed with a tapered portiony 9 5, the smallest part of which is located at 96. In full lines, the governor unit is shown located "so that rubber sleeve 71 is within the smallest part4r96 of the barrel.- Howeven since the ygovernor unit is pressed -into place on spindle 33, the unit may be forced to the left on the spindle, as shownV in dotted lines in Fig. 5, thereby bringing the unit Iinto the v the of the spindle.

^ tremely small ispeed. This is true,

ber `sleeve 71. Consequenty with the unit in the dotted line position of Fig. 5, the expansion of rubber sleeve 71 will have to be eater than it would in thefull line position .1n order to throttle the ilowof exhaust Huid through space 94 and thereb reduce the speed vernor unit, the spindle must to cause the greater sition of the operate at a h1 her s :expansion of t e ru ber sleeve necessary 1n mensioning of,l the parts of the governor unit,

and also by pro the indle 1n of Figs. may be maintained constantly within an expercentage of the desired even though the pressure head of the motive fluid supply varies considerably. l The governor r adjustment of the unit on e case of the modied form or ad'ustment thereon is a very simple matter. ith this unitary construction possible misplacement of parts is avoide The integral parts are few in number and, being cheap to manufacture, the initial cost of the device and of replacements therefor is low. Forming the #active governor member, viz. sleeve 71, of rubber or its equivalent has been found highly advantageous, particularly because of t e adaptability of a governor valve of this material to function eliciently even thou h o f small-size.

le the governor device has been illusence to a certain type Vof tool, including a fluid pressure motor, the invention obviously mounted or rotation in said 'casing 1 valve mounted on' said shaft for rotation is 'a plicable to fluid motors of other t pes. Alt ougli the preferred embodiment og the Linyention and a modifiedfform thereof` is therewith, said valve includin a rubber portion stretchable by centrifu force to control the liow of fluid through the casin ,2. The combination of a casing adapte `for the passage of fluid therethrough; a` shaft Hence, in t e dotted line po- 5 and 6,' the speed of the spindle device being in the form of'- .l a self-contained unit pressed onto the spindle,

its removal from the spindle and replacement metal sleeve only :trated and speclcally describedwith refer iritand ing a supporting mounted for rotation va'lve mounted on said shaft for rotation therewith, said valve consistin of an imper forate, resilient portion shifts. le b centrifugal force to control the flow of ilui through the casing.

3. The combination of a casing having an inlet port and an exhaust port; a rotor; and aystretchable rubber governor member located inthe casing between said ports and driven bythe rotor, said member being responsive to speed changes and acting as a centrifugal speed governor and regulating valve to control the amount of motive fluid passing through the rotor. y 4. he combination of a casing havin let and exhaust orts; a rotor mount operation in said) casin and a stretchable rubber governor valve ocated in the casing and driven by the rotor, said governor valve bei deformable by centrifu al force to control tglie passage of motive {iui from the rotor to the exhaust port.

5. A rotary governor valve in a fluid con ucting casing, said valve in# cluding a stretchable rubber portion deform- :able by centrifugal force to control the flow of fluid through the casing.

6. A'rotary governor valve unit adapted for use in a fluid conducting casing, said valve unit comprising a supporting member and a rubber sleeve mounted thereon and secured to the supporting member only at its ends, the intermediate free portion ofthe rubber sleeve being deformable by vcentrifugal force to contro the flow of fluid throughA the casing. Y

7; A rotary overnor valve unit adapted for use in a uid conducting casmg, said valve'unit comprising a metal sleeve, a rubber sleeve mounted on the metal sleeve, and a pair of metal collars fixed to the metal sleeve and connecting the rubber sleeve to the at its ends, the intermediate, free portion ofthe rubber sleeve being expansible by centrifu al force to control the How of fluid through tie casing.

8. A rotary governor -valve unit for use in a uid conducting casing, said valve unit bein' adapted for mounting upon a rotating mem er in the casin and including a resilient portion deforma le b centrifugal force to 'control' the flow of iluld through the casing, and means, other than said rotating member, rotatable with the unit for preventingengagement of sald resilient portion of the valve unit with the casing.

9. A rotary governor valve unit for use in a fluid conducting casing, said unit comprismember, `-a rubber member mounted on an secured to' the supportn member for rotation therewith, a portion o t said rubber member bein `free from the sufi-plowing memberandde ormable b centr y gal orce to control the low o fluid for in said casing; and a` adapted for use n ernor valve being through the casing; and means carried by the unit for limiting the deformation of the rubber member.

10. A rotar governor valve unit for use in a fluid con ucting casing, said unit comprising an inner rigid sleeve, an intermediate ru bersleeve secured onl ,at its ends to said inner sleeve, the interme iate ortion of the rubber sleeve being deformab e b cen trifugal force to control the flow o fluid through the casing, and an outer rigid sleeve supported at one end by theunit and forming a shroud at its opposite end surrounding the intermediate portion ofthe rubber. sleeve in spaced relation thereto, the space so formed being open at its outer 'end and communicating at its inner end with an annular series of openings in'the shroud. p

11. The combination of a casing having an inlet port and an exhaust port; a rotor; a rotary governor valve interposed between said ports and' driven by said rotor, said governor valve being responsive to speed changes and vdeformable to control the amount of motive ii'uid passing lthrou h the rotor; and means for limiting the de ormation of the governor valve so as to permit a quantity of motive fluid to flow through the rotor atall times.

12. In combination, a casing having inlet and exhaust ports; a rotor; aerotating mem- Yber driven by the rotor; a governor valve located between said ports and attached -to said rotating member, said governorvalve including a resilient portion expansible by centrifugal force to restrict the ilow of exhaust iiuid from the rotor to the exhaust port' and means, other than said rotating member, rotatable with'the overnor valve to limit the expansion of 'sai resilient portion.

13. The combination of a casing having a passageway of varyin cross section 'through which iuid is adapte to iow; and a rotary governor valve located in saidpassageway and deformableby centrifugal force to control the flow of fluid therethrough, said govadjustable to vary the 'cross sectional area o the normal flow path of the fluid through the casing.

14. The combination of a casing adapted for the passage of uid therethrough, and a rotary valve 1n said casing, said valve including a resilient, cylindrical portion adapted to be e anded by centrifugal force to restrict the ow ofiiuld through the ,c

15. In a device of the character dgrl'ied, the combination of a .turbine rotor,A including a runner and a shaft; a casing for the rotor, said casing being provided with inlet and outlet ports; Vand a. governor valve' c mounted on and secured to said shaft for roc tation therewith, said valve includin a rubber sleeve secured only at its ends to t e shaft,

the intermediate, free portion of the sleevel being expansible by centrifugal force to restrict the flow of motive fluid through the runner. v

16. In a device of the character described, the combination of a turbine rotor, including a runner and a shaft therefor; a casing for the rotor having inlet and outlet ports ,for motive fluid; and a governor valve on saidshaft between the runner and the exhaust port, said valve comprising an inner sleeve secured to the shaft, a rubber sleeve mounted on the inner sleeve, collars connecting only the ends of the rubber sleeve to the `inner sleeve, and an outer sleeveiixed on one of said collars' and having an annular shroud portion surrounding in spaced relation. the intermediate free portion of the rubber sleeve to limit the expansion thereof by centrifu al force, said shroud portion being formedY 1n- Sternally with a tapered valve seat havin an annular series of openings with whic said free portion of the rubber sleeve is ada ted to coact with regulating passage of motlve fluid between the shroud and the rubber sleeves 17. In a overnor for iiuid motors, the comi90 bination o a casing having a head portion and a barrel portion; a turbine runner in said head portion' a spindle for the runner journaled in the barrel portion, saidhead portion being1 provided with a motive fluid 05 inlet and sai arrel portion with an outlet for exhaust iiuid; and a governor valve mounted on said spindle betweenthe runner and the exhaust outlet, said valve being adapted to rotate with the spindle and including a rubber sleeve having a 4free portion shiftabe by centrifugal force upon excessive speed of rotation of the spindle to restrict the Howcf exhaust iiuid between the valve and the casing to the fluid outlet.

18. In a governor for pressure Huid actu- V ated motors the combination of a tubular casing through whichv motive pressure fluid flows; a shaft arranged to be driven by a governed motor and extending coaxially thro h said tubular casing; a member fixed on said shaft to rotate "therewith and substantiall .filling the `annular interval between the sha and casing, said member being ported to ermit passage of the major portion of said uid therethrough; and means also mounted on said shaft to turn therewith and adapted to be flexed by centrifu al force toobstruct pas-` sage of fluid throng vsaid ported member.

19. The combination of claim 18l further characterized in that the ported member is in the formy of a sleeve having anr annular shroud portion surroundin the Y shaft in spaced relation vthereto an provided with an annular series of ports for passage of said iuid therethrou h.

20. The'combination of claim 18l further' characterized in that saidfported member is in the form of a sleevediaving a body rtion at one end closely embrcing the s aft and provided at its opposite end with an aunular shroud surrounding the shaft in spaced relation thereto, the outer end of the shroud being arranged for Operation in Closely spaced relation to said casing, While the shroud is provided intermediate its outer end and the body portion With an annular series of ports for passage of said fluid therethrough, and the flexible means are arranged within said shroud portion for direct engagement with the ports. l

21. The Combination of a casing adapted for the passage of fluid therethrough; a shaft mounted for rotation in said casing; and a valve mounted on said shaft for rotation therewith, said Valve including an elastic portion adapted to be stretched b centrifugal force to control the flow of lui through the casing.

In testimony whereof I have signed my name to'this specification.

JOHN R. HOFFMAN.

CERTIFICME or CORRECTION.

Patent NO. 1,886,546. November 8, 1932.

JOHN R. HOFFMAN.

It is hereby Certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 6, line 88, Claim 16, for "with" read "for"; and that the said Letters Patent should be read with this correction therein that the same may Conform .to the record of the case in the Patent Office. Y

Signed and sealed this 27th day of December, A. D. 1932.

M. si. Moore,

(Seal) Acting Commissioner Of Patents.

and provided at its opposite end with an aunular shroud surrounding the shaft in spaced relation thereto, the outer end of the shroud being arranged for Operation in Closely spaced relation to said casing, While the shroud is provided intermediate its outer end and the body portion With an annular series of ports for passage of said fluid therethrough, and the flexible means are arranged within said shroud portion for direct engagement with the ports. l

21. The Combination of a casing adapted for the passage of fluid therethrough; a shaft mounted for rotation in said casing; and a valve mounted on said shaft for rotation therewith, said Valve including an elastic portion adapted to be stretched b centrifugal force to control the flow of lui through the casing.

In testimony whereof I have signed my name to'this specification.

JOHN R. HOFFMAN.

CERTIFICME or CORRECTION.

Patent NO. 1,886,546. November 8, 1932.

JOHN R. HOFFMAN.

It is hereby Certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 6, line 88, Claim 16, for "with" read "for"; and that the said Letters Patent should be read with this correction therein that the same may Conform .to the record of the case in the Patent Office. Y

Signed and sealed this 27th day of December, A. D. 1932.

M. si. Moore,

(Seal) Acting Commissioner Of Patents. 

